They are located in accordance with ANSI-approved standards including National Fire Protection Association (NFPA) 780- Installation of Lightning Protection Systems and related standards from the Lightning Protection Institute (LPI) and UL. These components must be UL-listed for use in lightning protection systems. Image courtesy of East Coast Lightning Equipment, Inc. Myriad connectors and fasteners are also required. On the roof, a typical lightning protection system includes: 1) Air terminals mounted around the perimeter, along ridges and other high points, on top of rooftop equipment that is not within a zone of protection created by strike termination devices mounted higher on the roof, and within the field of large roofs 2) A network of conductors that interconnect the air terminals and create multiple paths leading to ground and 3) Thru-roof assemblies that allow conductors to penetrate the roofing and roof deck. Then, after the reroofing, the lightning protection components have to be reinstalled or replaced to restore the integrity of the building’s lightning protection system.įigure 1. 1īefore reroofing can be performed, rooftop elements of the lightning protection system must be removed. When this happens, consideration must be given to the existing lightning protection equipment on the roof to ensure that the building remains safe from the ravages of lightning. Unfortunately, the same cannot be said of typical roofing systems and rooftop equipment they need routine servicing, occasional repairs, and, all too frequently, replacement. Most components of a lightning protection system can last the life of a structure with little maintenance.
Photos courtesy of Atlanta Lightning Protection. needed to be reroofed (left), the parts of the lightning protection system on the rooftop had to be reinstalled to meet current lightning protection standards (right).
When the Atlanta Fulton County Public Library in Atlanta, Ga.
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